People in the US spent more than 512 million dollars on blue-light glasses with clear lenses, which is a complete waste of their money. I’ll tell you why in 5 Minutes.

A clear lens can only remove a small amount of blue light

Blue light has a wavelength range from approximately 420 nm to 500 nm 

But

All transparent blue-light "blocking" glasses sold on the market do not block wavelengths longer than 420 nm.

They don't even block blue light below that level; they only filter about 20% of the wavelength.

The result is a mild filter. At 10 p.m., a bright screen still sends most of its blue light to your eyes.

Most clear blue light lenses use a thin reflective coating. It is the blue or purple glint you see when you tilt them under a lamp. The coating reflects away part of the blue light, often the shortest wavelengths, and lets the rest pass through.

The blue light that affects your sleep is the part clear lenses miss

Your eyes contain special cells that are not used for seeing shapes. They sense how bright and how blue the light around you is.

Your brain uses that signal to decide when to produce melatonin, the hormone that tells your body it is time to sleep.

In lab studies, this response was strongest at about 460 nm, which is a deep blue, and stayed active up to around 500 nm.

All clear lenses target the 400 to 450 nm range, the blue-violet end. A large part of the 450 to 500 nm range, where your body responds most, passes straight through.

Many clear lenses target blue-violet light. The light that affects your body clock most is a slightly different blue.

Choose a tinted lens that absorbs more blue light

So why do blue-light blocking glasses have to be yellow/orange/red?

All light comes in rainbow colors.

Light that comes from most indoor lights is a combination of red, orange, yellow, green, and blue wavelengths.

A lens that absorbs blue light changes that mix, and what reaches your eye looks yellow.

And that's why Day Lenses are yellow!

A lens that absorbs blue and green light leaves mostly orange and red, so it looks orange or red.

And that's why Night Lenses are orange or red! (Red is blocking the most)

The tint is the visible sign of how much light the lens absorbs. The deeper the color, the more light is removed.

Check the numbers on the lens, not just the label

Two numbers tell you what a lens does. The first is how much blue light it blocks. The second is how much visible light still gets through, which is called light transmission.

A brand that publishes neither number is asking you to trust the label. Ask for a lab test report for the exact lens you are buying.

Match the lens to the time of day

Most "blue-light" glasses in the country are completely transparent lenses with only a shiny blue reflective coating.

If the lenses does not have a yellow or red tint, it probably won't be blocking a significant portion of the harmful blue light emitted from LED and screen devices.

Eye protection Day Lenses completely block light from 400nm to 495nm, the most harmful range or artificial blue light.

Sleep quality Night Lenses, which are suitable for wearing at night, provide a noticable improvement in sleep quality by blocking 99.6% of blue and green light from 400nm to 550nm, which have a negative effect on sleep.

Three tinted lenses, one for each part of your day

We built Semovue around the four points above. We do not make a clear lens. Each of our three lenses has a published blocking percentage and light transmission, and each is made for a different part of the day.

• Yellow lens, for the workday. Blocks 84% of blue light and lets 88.5% of visible light through, so colors stay close to natural. Made for work and screen time indoors.
• Orange lens, for late afternoon and evening. Blocks about 97% of blue light and lets about 62% of visible light through. Colors shift toward warm tones and screens look slightly dimmer. Made for TV, reading, gaming and the hours when you wind down.
• Red lens, for the last hour before bed. Blocks about 99% of blue light and lets 26% of visible light through. This is our strongest filtering, with a strong color change. Made for reading or relaxing right before sleep.

Use them as a routine: yellow for the workday, orange once the sun goes down, red for the last hour before bed. All three come together in the bundle described above.

Good to know: orange and red lenses change how colors look, so skip them for photo or design work. Do not wear them while driving. All three lenses are made for indoor use. We do not offer prescription lenses yet, but you can wear our glasses with contact lenses.

Right now every order includes a second pair free, and our 30-day guarantee lets you test them in your own evenings. If you notice no difference, you can return them.

"I was pretty skeptical at first, but I actually love them."Noah D., Semovue customer